"As for what could use improvement: your tempo is unsteady, it doesn't sound like natural, deliberate rubato that you have control over. Your tone also sounds a bit rough around the edges. On the plus side, it sounds like you already got an ear for phrasing and layering/orchestration. Phrasing could be better, so keep working and refining that."
Let's start from a different point. Listen to what you've played and compare it with a professional recording. What are the differences that you hear? If you report back, we could give you some suggestions on what to listen for. Alternatively, if you listen carefully a lot, you will automatically start to hear many things.
Thanks for your wise advice. Could you give me a clear and well-explained way of improving the downsides of my playing? Like, for example, how to improve my phrasing and how to do a smooth rubato. I would like to have a answer for all of them.